P1800ES strange overdrive issue

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P1800ES strange overdrive issue

PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Mar 27th, 2021, 16:32	#1
P1800 ES Junior Member Last Online: Mar 17th, 2023 06:04 Join Date: Sep 2020 Location: St Albans	P1800ES strange overdrive issue I changed my gearbox oil today hoping it would solve my overdrive issues but it hasn’t made any difference. Only half a litre of oil came out. I emptied it with the rear jacked up high and filled it with the front up in the air. It took the required 1.6 litres so I was confident it filled correctly and I filled it very slowly. For the first few minutes of driving it behaves perfectly, engages and disengages quickly when I flick the lever and only in 4th gear. After a few highway miles it stops working in 4th gear and seems to engage itself when I pull away in 1st. This suggests the wiring and solenoid is fine, but I can’t figure out what’s causing this behaviour when it’s up to temp. Has anyone got a clue what might be happening? I’m at a loss now. Only thing I can think to try is cleaning out the strainer and filter??

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